Given the absence of online guidance about how to deal with disposal of toxic substances by Singapore households, we are guided by resources from other countries.

Examples: How to Dispose of Bleach | How to Dispose of Thinner

Generally speaking, the recommendation is to put the substance in an HDPE bottle or metal resealable can and dispose of it in the trash. Ensure it is well sealed before disposal.

For large volumes, hire a toxic industrial waste collector. 

Read more at NEA's website: Toxic Waste Control